// https://stackoverflow.com/a/68523152

function cyrb128(str: string) {
  let h1 = 1779033703,
    h2 = 3144134277,
    h3 = 1013904242,
    h4 = 2773480762;
  for (let i = 0, k; i < str.length; i++) {
    k = str.charCodeAt(i);
    h1 = h2 ^ Math.imul(h1 ^ k, 597399067);
    h2 = h3 ^ Math.imul(h2 ^ k, 2869860233);
    h3 = h4 ^ Math.imul(h3 ^ k, 951274213);
    h4 = h1 ^ Math.imul(h4 ^ k, 2716044179);
  }
  h1 = Math.imul(h3 ^ (h1 >>> 18), 597399067);
  h2 = Math.imul(h4 ^ (h2 >>> 22), 2869860233);
  h3 = Math.imul(h1 ^ (h3 >>> 17), 951274213);
  h4 = Math.imul(h2 ^ (h4 >>> 19), 2716044179);
  return [
    (h1 ^ h2 ^ h3 ^ h4) >>> 0,
    (h2 ^ h1) >>> 0,
    (h3 ^ h1) >>> 0,
    (h4 ^ h1) >>> 0,
  ];
}

function mulberry32(a: number) {
  return function () {
    var t = (a += 0x6d2b79f5);
    t = Math.imul(t ^ (t >>> 15), t | 1);
    t ^= t + Math.imul(t ^ (t >>> 7), t | 61);
    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
  };
}

export const seededRandom = (seed: string) => {
  const rng = mulberry32(cyrb128(seed)[0]!);

  const rnd = (lo: number, hi?: number, defaultHi = 1) => {
    if (hi === undefined) {
      hi = lo === undefined ? defaultHi : lo;
      lo = 0;
    }

    return rng() * (hi - lo) + lo;
  };

  const rndInt = (lo: number, hi?: number) => Math.floor(rnd(lo, hi, 2));

  const shuffle = <T>(o: T[]) => {
    const a = o.slice();

    for (let i = a.length - 1; i > 0; i--) {
      const j = rndInt(i + 1);
      const x = a[i];
      a[i] = a[j]!;
      a[j] = x!;
    }

    return a;
  };

  return { rnd, rndInt, shuffle };
};